authlogic_facebook_connect_registrations.diff

diff --git a/vendor/plugins/authlogic_facebook_connect/lib/authlogic_facebook_connect/acts_as_authentic.rb b/vendor/plugins/authlogic_facebook_connect/lib/authlogic_facebook_connect/acts_as_authentic.rb
index fb9fa1b..9f08b05 100644
--- a/vendor/plugins/authlogic_facebook_connect/lib/authlogic_facebook_connect/acts_as_authentic.rb
+++ b/vendor/plugins/authlogic_facebook_connect/lib/authlogic_facebook_connect/acts_as_authentic.rb
@@ -11,10 +11,32 @@ module AuthlogicFacebookConnect
     end
     
     module Methods
+      # Set up some simple validations
       def self.included(klass)
+        return if !klass.column_names.include?('facebook_uid')
+        
         klass.class_eval do
+          validate :validate_by_facebook_connect, :if => :authenticating_with_facebook_connect?
+          validates_uniqueness_of :facebook_uid, :scope => validations_scope, :if => :using_facebook_connect?
         end
       end
+      
+      private
+        def session_facebook_uid
+          session_class.controller.facebook_session.user.uid
+        end
+        
+        def authenticating_with_facebook_connect?
+          (session_class.controller.params && !session_class.controller.params[:register_with_facebook_connect].blank?)
+        end
+        
+        def using_facebook_connect?
+          respond_to?(:facebook_uid) && !facebook_uid.blank?
+        end
+        
+        def validate_by_facebook_connect
+          write_attribute(:facebook_uid, session_facebook_uid.blank? ? nil : session_facebook_uid)
+        end
     end
   end
 end
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